City-Data.com: Marion County, Iowa
- Profiles population demographics, jobs, housing, agriculture and crime statistics. Contains a list of recreational areas, churches, cemeteries, post offices, charts, graphs and maps.
- http://www.city-data.com/county/Marion_County-IA.html

Marion County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19125.html

Iowa State University Extension - Marion County
- Offers agricultural, business, family and 4-H programs and resources. Includes staff directory, news, events, hours and directions. Located in Knoxville.
- http://www.extension.iastate.edu/marion/

Knoxville Area Community Hospital
- Offers quality healthcare, emergency room service, wellness clinics, support groups plus several specialty clinics.
- http://www.kach.org

Marion County Iowa
- Historic Marion County, Iowa's leading vacation destination. Marion County boasts Pella's Tulip Time, Amoco Knoxville Nationals, Lake Red Rock, and Iowa's largest lake.
- http://www.redrockarea.com